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TPS50601A-SP: Parameters

Frank Sun
Intellectual 925 points
Part Number: TPS50601A-SP

Greetings,

I want to know the minimum and maximum duty cycles for TPS50601A-SP,

Can you point to the documentation that tells me what the minimum and maximum duty cycles are? I also don't see any maximum power dissipation ratings in the datasheet.

Thanks,

Regards,

  • 0
    TI__Genius 14540 points

    The minimum duty cycle is governed by the min on time specification which must 235ns worst case.  For a given input voltage and switching frequency, there is minimum output voltage, or min duty cycle, that will satisfy this spec.  Put another way, for a given VIN and VOUT, i.e. duty cycle set, there is a maximum frequency that will satisfy the min on time specification.  One must calculate this to ensure the spec is respected.

    This device does not have a min off time spec and can theoretically run at 100% duty cycle, or very close to it considering IOUT * RDSON of output FET will not allow 100% duty cycle.  I will be happy to comment on specific application requirements you might be trying to meet if you want to share those.

    Thanks

    Christian

  • 0 in reply to Christian Yots
    Intellectual 925 points

    Hi Christian,

    Thank u for your response.

    One more question,

     I have a limited understanding of the inner workings of the Sync circuitry. It's not discussed in any detail. I'm wondering if during start-up i can hold the sync signal low for 10-20ms while my system starts up, without damaging the chip? Past the point at which we have power good.

    Thanks,

    Regards,

  • 0 in reply to Frank Sun
    TI__Genius 14540 points

    Not sure it is a good idea to pull SYNC to hard ground, since SYNC can be an output. I understand that when RT is populated SYNC should be an input, but to be safe it is better to use a resistor to ground it.

    We recommend to use 1Kohm to ground SYNC when not using as input. This is a recommendation to improve SETs.

    Thanks

    Christian

  • 0 in reply to Christian Yots
    Prodigy 190 points

    I will be providing an external sync signal to two of these chips, would you still recommend a resistor to ground?  Would it be 2K instead of 1K?

    Thanks,

    Neli